"The chance to show that I do in some small degree participate in the grace that saved me"

I think about my encounters with people in this manner, too, but I wish I could be more consistent. Here is Reverend Ames in Marilynne Robinson's Gilead, reflecting on life as a pastor. Of course, its applicable to every believer, whatever calling you're in:

When you encounter another person, when you have dealings with anyone at all, it is as if a question is being put to you. So you must think, What is the Lord asking of me in this moment, in this situation? If you confront insult or antagonism, your first impulse will be to respond in kind. But if you think, as it were, This is an emissary sent from the Lord, and some benefit is intended for me, first of all the occasion to demonstrate my faithfulness, the chance to show that I do in some small degree participate in the grace that saved me, you are free to act otherwise than as circumstances would seem to dictate. You are free to act by your own lights. You are freed at the same time of the impulse to hate or resent that person. He would probably laugh at the thought that the Lord sent him to you for your benefit (and his), but that is the perfection of the disguise, his own ignorance of it.

Posted with Blogsy